Canon iR1200 Series, Service Manual

Page: 115 / 494

Chapter 3
3-11
3.2 Basic Sequence
3.2.1 Basic Sequence of Operations at Power-On
0006-2867
The following is the flow of operation occurring from when the machine is turned on until it enters standby state:
F-3-7
Standby
Power-On
Initializes the CPU,
Clears the RAM, Sets the Port
Starts communication
with the image processor PCB.
• Checks the reader unit (open/close).
• Toner supply cover open/closed detection
• Toner bottle present/absent detection
• Checks paper (cassette, manual tray).
• Detects size of paper (LGL; cassette).
• Checks the thermistor (open/short).
Fixing Heater On
The primary charging AC/DC bias,
Transfer Cleaning Bias ON
The developing AC/DC bias goes ON.
The primary charging DC bias and
developing AC/DC bias go OFF.
The main motor and
primary charging AC bias go OFF.
The transfer cleaning bias goes OFF.
Auto delivery occurs
if the paper leading edge sensor detects paper.
A jam is identified if the paper leading edge se
or the delivery sensor detects paper.
Checks the machine inside for residual paper.
NO
YES
0.2 sec after the fixing heater goes ON,
is the fixing temperature 100˚C ? Or, has 0.5 sec
passedafter the fixing heater went ON?
A check is made for the presence/absence of a c
when the primary charging AC bias is applied.
The toner level is checked when the developing
Fixing Heater OFF
Main Motor ON
When the main motor goes ON, the machine always ch
the level of waste toner.